16" x 30" or 30" x 16" Cube Core Eggcrate Return Air Grille Compatible with Duct 10" + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening)

with no sharp edges to worry about

9% Pure Copper)

+ Product Details Size - 6" X 6" is the size for the duct opening measurement only

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16" x 30" or 30" x 16" Cube Core Eggcrate Return Air Grille Compatible with Duct 10" + Product Details Perfect Fit+ Product Details Size 16" x 30" or 30" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" X 31. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing